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Home >> Volvo >> 2004 >> XC70 >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 9 (Alarm System, Control Modules, Engine Management Systems - Design And Function) >> Central Electronic Module (CEM) (2005-2007) >> Function >> Front parking lamps
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Front parking lamps

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Fig 1: Front Parking Lamps Communication Diagram
GLL146390Courtesy of VOLVO CARS OF NORTH AMERICA.

Parking lamps (10/11-12) light when:

The lamp switch module (LSM) transmits data using serial communication to the central electronic module (CEM) (4/56) to activate the lamps.

The lamps are supplied with power via a relay which is activated by the central electronic module (CEM). The front parking lamps have a direct power supply.

The rear parking lamps and license plate lighting are powered by the rear electronic module (REM).

There is a Limp Home function for the parking lamps so that they will work even if there is a fault in the control area network (CAN) or in the serial communication between the light switch module (LSM) and the central electronic module (CEM).